全文获取类型
收费全文 | 10118篇 |
免费 | 843篇 |
国内免费 | 37篇 |
专业分类
电工技术 | 135篇 |
综合类 | 13篇 |
化学工业 | 2140篇 |
金属工艺 | 237篇 |
机械仪表 | 388篇 |
建筑科学 | 232篇 |
矿业工程 | 4篇 |
能源动力 | 402篇 |
轻工业 | 743篇 |
水利工程 | 31篇 |
石油天然气 | 4篇 |
无线电 | 1754篇 |
一般工业技术 | 1973篇 |
冶金工业 | 1687篇 |
原子能技术 | 125篇 |
自动化技术 | 1130篇 |
出版年
2024年 | 13篇 |
2023年 | 91篇 |
2022年 | 151篇 |
2021年 | 226篇 |
2020年 | 188篇 |
2019年 | 233篇 |
2018年 | 312篇 |
2017年 | 249篇 |
2016年 | 365篇 |
2015年 | 307篇 |
2014年 | 411篇 |
2013年 | 666篇 |
2012年 | 499篇 |
2011年 | 654篇 |
2010年 | 512篇 |
2009年 | 526篇 |
2008年 | 509篇 |
2007年 | 409篇 |
2006年 | 378篇 |
2005年 | 315篇 |
2004年 | 303篇 |
2003年 | 264篇 |
2002年 | 245篇 |
2001年 | 221篇 |
2000年 | 194篇 |
1999年 | 227篇 |
1998年 | 617篇 |
1997年 | 379篇 |
1996年 | 284篇 |
1995年 | 196篇 |
1994年 | 160篇 |
1993年 | 119篇 |
1992年 | 66篇 |
1991年 | 68篇 |
1990年 | 79篇 |
1989年 | 75篇 |
1988年 | 66篇 |
1987年 | 58篇 |
1986年 | 61篇 |
1985年 | 38篇 |
1984年 | 26篇 |
1983年 | 30篇 |
1982年 | 10篇 |
1981年 | 26篇 |
1980年 | 25篇 |
1979年 | 11篇 |
1978年 | 14篇 |
1977年 | 30篇 |
1976年 | 53篇 |
1975年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
161.
Seung Jin Chang Jae Young Lee Jin Bae Park Yoon Ho Choi 《International Journal of Control, Automation and Systems》2015,13(2):311-318
In this paper, we propose an actor-critic neuro-control for a class of continuous-time nonlinear systems under nonlinear abrupt faults, which is combined with an adaptive fault diagnosis observer (AFDO). Together with its estimation laws, an AFDO scheme, which estimates the faults in real time, is designed based on Lyapunov analysis. Then, based on the designed AFDO, a fault tolerant actor- critic control scheme is proposed where the critic neural network (NN) is used to approximate the value function and the actor NN updates the fault tolerant policy based on the approximated value function in the critic NN. The weight update laws for critic NN and actor NN are designed using the gradient descent method. By Lyapunov analysis, we prove the uniform ultimately boundedness (UUB) of all the states, their estimation errors, and NN weights of the fault tolerant system under the unpredictable faults. Finally, we verify the effectiveness of the proposed method through numerical simulations. 相似文献
162.
Xiao Teng-Fei Li Xiao-Dong Ho John K. L. 《International Journal of Control, Automation and Systems》2015,13(1):222-230
In this article, a novel fuzzy systems based on adaptive Iterative Learning Control (ILC) strategy is presented to deal with a class of non-parametric nonlinear discrete-time systems which perform iteration-varying reference trajectory tracking. Using the technique of fuzzy systems to compensate for the non-parametric uncertainty of the discrete-time system dynamics, the proposed adaptive ILC scheme can well track the iteration-varying reference trajectory beyond the initial time points. The convergence of the fuzzy systems based adaptive ILC algorithm is guaranteed by theoretical analysis, and a numerical example is given to illustrate the effectiveness of the adaptive ILC scheme.
相似文献163.
We propose a measurement feedback controller for a class of feedforward nonlinear systems under sensor noise. The sensor noise has unknown magnitude, frequency, and phase. Our proposed controller is coupled with a low‐pass filter in such a way that the sensor noise is attenuated. We show that the controlled system results in bounded states whose ultimate bounds are inversely proportional to the minimum frequency of the sensor noise. Our result is further generalized to work in a case where the sensor noise is only required to have a Fourier transform with finite energy. Moreover, if the sensor noise enters only at partial states, depending on the location of the sensor noise, the ultimate bounds of the particular states can be made arbitrarily small via the gain factor of the controller. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
164.
The pixel labeling problems in computer vision are often formulated as energy minimization tasks. Algorithms such as graph cuts and belief propagation are prominent; however, they are only applicable for specific energy forms. For general optimization, Markov Chain Monte Carlo (MCMC) based simulated annealing can estimate the minima states very slowly.This paper presents a sampling paradigm for faster optimization. First, in contrast to previous MCMCs, the role of detailed balance constraint is eliminated. The reversible Markov chain jumps are essential for sampling an arbitrary posterior distribution, but they are not essential for optimization tasks. This allows a computationally simple window cluster sample. Second, the proposal states are generated from combined sets of local minima which achieve a substantial increase in speed compared to uniformly labeled cluster proposals. Third, under the coarse-to-fine strategy, the maximum window size variable is incorporated along with the temperature variable during simulated annealing. The proposed window annealing is experimentally shown to be many times faster and capable of finding lower energy compared to the previous Gibbs and Swendsen-Wang cut (SW-cut) sampler. In addition, the proposed method is compared with other deterministic algorithms like graph cut, belief propagation, and spectral method in their own specific energy forms. Window annealing displays competitive performance in all domains. 相似文献
165.
The diameter of a graph is an important factor for communication as it determines the maximum communication delay between any pair of processors in a network. Graham and Harary [N. Graham, F. Harary, Changing and unchanging the diameter of a hypercube, Discrete Applied Mathematics 37/38 (1992) 265-274] studied how the diameter of hypercubes can be affected by increasing and decreasing edges. They concerned whether the diameter is changed or remains unchanged when the edges are increased or decreased. In this paper, we modify three measures proposed in Graham and Harary (1992) to include the extent of the change of the diameter. Let D-k(G) is the least number of edges whose addition to G decreases the diameter by (at least) k, D+0(G) is the maximum number of edges whose deletion from G does not change the diameter, and D+k(G) is the least number of edges whose deletion from G increases the diameter by (at least) k. In this paper, we find the values of D-k(Cm), D-1(Tm,n), D-2(Tm,n), D+1(Tm,n), and a lower bound for D+0(Tm,n) where Cm be a cycle with m vertices, Tm,n be a torus of size m by n. 相似文献
166.
167.
Ho Woo Lee Sahng Hoon Cheon Se Won Lee Jung Woo Baek 《Discrete Event Dynamic Systems》2008,18(4):537-562
This paper studies the steady-state queue length process of the MAP/G/1 queue under the dyadic control of the D-policy and multiple server vacations. We derive the probability generating function of the queue length and the mean queue
length. We then present computational experiences and compare the MAP queue with the Poisson queue.
相似文献
Ho Woo LeeEmail: |
168.
Youn‐Gyoung Chang Seong‐Hee Nam Nam‐Kook Kim Yun‐Ho Kook Jinook Kim Soon‐Sung Yoo Chang‐Dong Kim In‐Byeong Kang In‐Jae Chung 《Journal of the Society for Information Display》2009,17(4):301-307
Abstract— Recently, potential breakthrough technologies for low‐cost processing of TFT‐LCDs and new process developments for flexible‐display fabrication have been widely studied. A roll‐printing process using etch‐resist material as a replacement for photolithographic patterning was investigated. The characterization of the properties of patterns formed in roll printing, a method to fabricate cliché plates for fine patterns, and the design of a new formulation for resist printing ink is reported. The pattern position accuracy, which is one of the most important issues for the successful application of printing processes in display manufacturing was studied and how it can be improved by optimizing the blanket roll structure is explained. New design rules for the layout of the thin‐film‐transistor array was derived to improve the compatibility of roll printing. As a result, a prototype 15‐in.‐XGA TFT‐LCD panel was fabricated by using printing processes to replace all the photolithographic patterning steps conventionally used. 相似文献
169.
Jae Kyeong Jeong Jong Han Jeong Hui Won Yang Tae Kyung Ahn Minkyu Kim Kwang Suk Kim Bon Seog Gu Hyun‐Joong Chung Jin‐Seong Park Yeon‐Gon Mo Hye Dong Kim Ho Kyoon Chung 《Journal of the Society for Information Display》2009,17(2):95-100
Abstract— A full‐color 12.1‐in.WXGA active‐matrix organic‐light‐emitting‐diode (AMOLED) display was, for the first time, demonstrated using indium‐gallium‐zinc oxide (IGZO) thin‐film transistors (TFTs) as an active‐matrix backplane. It was found that the fabricated AMOLED display did not suffer from the well‐known pixel non‐uniformity in luminance, even though the simple structure consisting of two transistors and one capacitor was adopted as the unit pixel circuit, which was attributed to the amorphous nature of IGZO semiconductors. The n‐channel a‐IGZO TFTs exhibited a field‐effect mobility of 17 cm2/V‐sec, threshold voltage of 1.1 V, on/off ratio >109, and subthreshold gate swing of 0.28 V/dec. The AMOLED display with a‐IGZO TFT array is promising for large‐sized applications such as notebook PCs and HDTVs because the a‐IGZO semiconductor can be deposited on large glass substrates (larger than Gen 7) using the conventional sputtering system. 相似文献
170.
Jung Min Cho Kyoung Ho Lee Chae Il Cheon Woon Seog Choi Jeong Seog Kim Nam In Cho 《Journal of the Society for Information Display》2009,17(9):765-770
Abstract— A flexible fluorescent lamp that utilizes the same plasma discharge mode as in PDPs has been manufactured. The structure of the flexible lamp is simple and easy to manufacture. All‐plastic materials including plastic substrates, barrier ribs (spacers), and sealants for low‐temperature manufacturing processing have been adopted except for the phosphor and MgO thin film. The MgO thin films were coated on the plastic substrates as a protection layer against the plasma discharge. The adhesion and biaxial texture of MgO thin film deposited on the plastic substrates, poly‐ethyle‐nenaphthalate (PEN) and polycarbonate (PC), at low temperature (100–180°C) has been characterized. The MgO film on PEN shows good adhesion under a repeated bending test. The manufactured flexible lamp consists of two plastic substrates of about 3 in. on the diagonal, barrier rib (spacer), and external ITO electrodes. The Ne‐Xe (5%) gas mixture at 100–200 Torr was used for the discharge gas. A maximum surface luminance of about 100 cd/m2 was achieved for a 1 ‐kHz AC pulse. 相似文献